TypeError:ufunc'subtract'不包含签名匹配类型为dtype('< U1')dtype('< U1')dtype('< U1')的循环 [英] TypeError: ufunc 'subtract' did not contain a loop with signature matching types dtype('<U1') dtype('<U1') dtype('<U1')

问题描述

尝试获取微小玩具数据集的直方图时，通过matplotlib从numpy产生了奇怪的错误.我只是不确定如何解释该错误，这使得很难看到下一步该怎么做.

Strange error from numpy via matplotlib when trying to get a histogram of a tiny toy dataset. I'm just not sure how to interpret the error, which makes it hard to see what to do next.

虽然此gdsCAD问题表面上相似.

我希望底部的调试信息比驱动程序代码更有用，但是如果我错过了一些事情，请询问.作为现有测试套件的一部分，这是可重现的.

I intend the debugging info at bottom to be more helpful than the driver code, but if I've missed something, please ask. This is reproducible as part of an existing test suite.

        if n > 1:
            return diff(a[slice1]-a[slice2], n-1, axis=axis)
        else:
>           return a[slice1]-a[slice2]
E           TypeError: ufunc 'subtract' did not contain a loop with signature matching types dtype('<U1') dtype('<U1') dtype('<U1')

../py2.7.11-venv/lib/python2.7/site-packages/numpy/lib/function_base.py:1567: TypeError
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> entering PDB >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> py2.7.11-venv/lib/python2.7/site-packages/numpy/lib/function_base.py(1567)diff()
-> return a[slice1]-a[slice2]
(Pdb) bt
[...]
py2.7.11-venv/lib/python2.7/site-packages/matplotlib/axes/_axes.py(5678)hist()
-> m, bins = np.histogram(x[i], bins, weights=w[i], **hist_kwargs)
  py2.7.11-venv/lib/python2.7/site-packages/numpy/lib/function_base.py(606)histogram()
-> if (np.diff(bins) < 0).any():
> py2.7.11-venv/lib/python2.7/site-packages/numpy/lib/function_base.py(1567)diff()
-> return a[slice1]-a[slice2]
(Pdb) p numpy.__version__
'1.11.0'
(Pdb) p matplotlib.__version__
'1.4.3'
(Pdb) a
a = [u'A' u'B' u'C' u'D' u'E']
n = 1
axis = -1
(Pdb) p slice1
(slice(1, None, None),)
(Pdb) p slice2
(slice(None, -1, None),)
(Pdb)

推荐答案

为什么将diff应用于字符串数组.

Why is it applying diff to an array of strings.

尽管有不同的消息，但我在同一时间遇到了错误

I get an error at the same point, though with a different message

In [23]: a=np.array([u'A' u'B' u'C' u'D' u'E'])

In [24]: np.diff(a)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-24-9d5a62fc3ff0> in <module>()
----> 1 np.diff(a)

C:\Users\paul\AppData\Local\Enthought\Canopy\User\lib\site-packages\numpy\lib\function_base.pyc in diff(a, n, axis)
   1112         return diff(a[slice1]-a[slice2], n-1, axis=axis)
   1113     else:
-> 1114         return a[slice1]-a[slice2]
   1115 
   1116 

TypeError: unsupported operand type(s) for -: 'numpy.ndarray' and 'numpy.ndarray' 

此a数组是bins参数吗?文档说bins应该是什么?

Is this a array the bins parameter? What does the docs say bins should be?

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